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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef WEBKIT_APPCACHE_APPCACHE_REQUEST_HANDLER_H_
#define WEBKIT_APPCACHE_APPCACHE_REQUEST_HANDLER_H_
#include "base/compiler_specific.h"
#include "base/supports_user_data.h"
#include "webkit/appcache/appcache_entry.h"
#include "webkit/appcache/appcache_export.h"
#include "webkit/appcache/appcache_host.h"
#include "webkit/glue/resource_type.h"
namespace net {
class URLRequest;
class URLRequestJob;
} // namespace net
namespace appcache {
class AppCacheURLRequestJob;
// An instance is created for each net::URLRequest. The instance survives all
// http transactions involved in the processing of its net::URLRequest, and is
// given the opportunity to hijack the request along the way. Callers
// should use AppCacheHost::CreateRequestHandler to manufacture instances
// that can retrieve resources for a particular host.
class APPCACHE_EXPORT AppCacheRequestHandler
: public base::SupportsUserData::Data,
public AppCacheHost::Observer,
public AppCacheStorage::Delegate {
public:
virtual ~AppCacheRequestHandler();
// These are called on each request intercept opportunity.
AppCacheURLRequestJob* MaybeLoadResource(net::URLRequest* request);
AppCacheURLRequestJob* MaybeLoadFallbackForRedirect(net::URLRequest* request,
const GURL& location);
AppCacheURLRequestJob* MaybeLoadFallbackForResponse(net::URLRequest* request);
void GetExtraResponseInfo(int64* cache_id, GURL* manifest_url);
static bool IsMainResourceType(ResourceType::Type type) {
return ResourceType::IsFrame(type) ||
ResourceType::IsSharedWorker(type);
}
private:
friend class AppCacheHost;
// Callers should use AppCacheHost::CreateRequestHandler.
AppCacheRequestHandler(AppCacheHost* host, ResourceType::Type resource_type);
// AppCacheHost::Observer override
virtual void OnDestructionImminent(AppCacheHost* host) OVERRIDE;
// Helpers to instruct a waiting job with what response to
// deliver for the request we're handling.
void DeliverAppCachedResponse(const AppCacheEntry& entry, int64 cache_id,
int64 group_id, const GURL& manifest_url,
bool is_fallback,
const GURL& namespace_entry_url);
void DeliverNetworkResponse();
void DeliverErrorResponse();
// Helper to retrieve a pointer to the storage object.
AppCacheStorage* storage() const;
bool is_main_resource() const {
return IsMainResourceType(resource_type_);
}
// Main-resource loading -------------------------------------
// Frame and SharedWorker main resources are handled here.
void MaybeLoadMainResource(net::URLRequest* request);
// AppCacheStorage::Delegate methods
virtual void OnMainResponseFound(
const GURL& url, const AppCacheEntry& entry,
const GURL& fallback_url, const AppCacheEntry& fallback_entry,
int64 cache_id, int64 group_id, const GURL& mainfest_url) OVERRIDE;
// Sub-resource loading -------------------------------------
// Dedicated worker and all manner of sub-resources are handled here.
void MaybeLoadSubResource(net::URLRequest* request);
void ContinueMaybeLoadSubResource();
// AppCacheHost::Observer override
virtual void OnCacheSelectionComplete(AppCacheHost* host) OVERRIDE;
// Data members -----------------------------------------------
// What host we're servicing a request for.
AppCacheHost* host_;
// Frame vs subresource vs sharedworker loads are somewhat different.
ResourceType::Type resource_type_;
// Subresource requests wait until after cache selection completes.
bool is_waiting_for_cache_selection_;
// Info about the type of response we found for delivery.
// These are relevant for both main and subresource requests.
int64 found_group_id_;
int64 found_cache_id_;
AppCacheEntry found_entry_;
AppCacheEntry found_fallback_entry_;
GURL found_namespace_entry_url_;
GURL found_manifest_url_;
bool found_network_namespace_;
// True if a cache entry this handler attempted to return was
// not found in the disk cache. Once set, the handler will take
// no action on all subsequent intercept opportunities, so the
// request and any redirects will be handled by the network library.
bool cache_entry_not_found_;
// The job we use to deliver a response.
scoped_refptr<AppCacheURLRequestJob> job_;
friend class AppCacheRequestHandlerTest;
DISALLOW_COPY_AND_ASSIGN(AppCacheRequestHandler);
};
} // namespace appcache
#endif // WEBKIT_APPCACHE_APPCACHE_REQUEST_HANDLER_H_